Andrea, this is the site you need:
"Problem" Ferrets and the People who Love Them
 
http://www.geocities.com/SoHo/Lofts/1083/probintro.html
 
Has she had a dental check?  Mal-erupted teeth and the abscesses they
cause are often the root cause of biting in kits.
[Posted in FML issue 4999]